International Service for the Geoid

ISG' activities are on educational, research, and data distribution sides: principal purposes of ISG are the collection and distribution of geoid models, the collection and distribution of software for geoid computation, and the organization of technical schools on geoid determinations. ISG collects and disseminates worldwide local and regional geoid models estimated by geodetic Institutions and researchers of many countries. More than 30 countries are represented, listed in alphabetic order or localized on a map

ISG 的活动主要涵盖教育、研究和数据分发三个方面：ISG 的核心宗旨在于收集和分发大地水准面模型、收集和分发大地水准面计算软件，以及组织大地水准面测定技术学校。ISG 负责收集和传播全球范围内由各国测绘机构及研究人员估算的地方和区域大地水准面模型，涉及超过30个国家，这些国家按字母顺序排列或在地图上标示。